Revert "Remove Array#inquiry"

This reverts commit 9420de59.

Reason: Turns out we want to keep this method.

activesupport/CHANGELOG.md

-*   Added `ActiveSupport::ArrayInquirer`.
+*   Added `ActiveSupport::ArrayInquirer` and `Array#inquiry`.
 
     Wrapping an array in an `ArrayInquirer` gives a friendlier way to check its
     contents:
@@ -13,6 +13,9 @@
         variants.any?(:phone, :desktop)  # => true
         variants.any?(:desktop, :watch)  # => false
 
+    `Array#inquiry` is a shortcut for wrapping the receiving array in an
+    `ArrayInquirer`.
+
     *George Claghorn*
 
 *   Deprecate `alias_method_chain` in favour of `Module#prepend` introduced in Ruby 2.0

activesupport/lib/active_support/core_ext/array.rb

@@ -4,3 +4,4 @@
 require 'active_support/core_ext/array/extract_options'
 require 'active_support/core_ext/array/grouping'
 require 'active_support/core_ext/array/prepend_and_append'
+require 'active_support/core_ext/array/inquiry'

activesupport/lib/active_support/core_ext/array/inquiry.rb

+class Array
+  # Wraps the array in an +ArrayInquirer+ object, which gives a friendlier way
+  # to check its string-like contents.
+  #
+  #   pets = [:cat, :dog].inquiry
+  #
+  #   pets.cat?     # => true
+  #   pets.ferret?  # => false
+  #
+  #   pets.any?(:cat, :ferret)  # => true
+  #   pets.any?(:ferret, :alligator)  # => false
+  def inquiry
+    ActiveSupport::ArrayInquirer.new(self)
+  end
+end

activesupport/test/array_inquirer_test.rb

@@ -25,4 +25,11 @@ def test_any_with_block
   def test_respond_to
     assert_respond_to @array_inquirer, :development?
   end
+
+  def test_inquiry
+    result = [:mobile, :tablet].inquiry
+
+    assert_instance_of ActiveSupport::ArrayInquirer, result
+    assert_equal @array_inquirer, result
+  end
 end